Sifter or screen



(No Model.)

J. B. WHITE. SIPTER 0R SGREEN.

No. 449,342. Patented Mar. 31, 1891 [menor Jar wb-B. mam

n15 new: FEIERS cu, wo'rom'nm, WASHINGTON, a. c.

extend above and below the box A.

STATES PATENT SIFTER OR SCREEN.

SPECIFICATION forming part of Letters Patent No. 449,342, dated March31, 1891.

Application filed January 8, 1891- Serial No. 377,130- (No model.)

To all whom it may concern:

Be it known that 1, JARVIS BUFFUM WHITE, residing at Millbury, in thecounty of \Vorcester and State of Massachusetts, have invented certainnew and useful Improvements in Sifters or Screens, of which thefollowing is a specification, reference being had therein to theaccompanying drawings.

This invention relates to sitters or screens for ashes, sand, and thelike.

The object of the invention is to produce a screen or sifter which maybe easily operated, and which will be effective in operation.

Figure l of the drawings is a perspective view of the screen andsupport. Fig. 2 is a section on line m m, Fig. 1. Fig. 3 isa brokendetail elevation showing the star-wheel and abutments on the side of thescreen.

A indicates a box, frame, or casing of suitable size and provided withlegs A which The bars A A connect the upper ends of the pairs of legs,as shown in Figs. land 2. Rods, ropes, or wires are connected to thebars A and to swing-boardsF F ata suitable distance below said bars A.The bars F and their supporting ropes or wires form two swings, oneswing being near each end of the frame or casing. The ropes or wires (6maybe supported at the top in swivel-rings b, orin other suitablemanner, for supporting a swing.

The screen proper B, having a bottom G of suitable mesh, rests near itsends on the swingbars F F. The corners of the screenboX B may be notchedto fit closely on bars F; but this is not essential. The screen can bereadily removed from the swings for dumping coals, gravel, or the like.

One side of the screen B has two projecting ears or abutments E E, theseabutments being arranged obliquely from the center of that side of thescreen to which they are applied.

A star-wheel or armed wheel D is hung on a shaft D in the casing A insuch position that its center is between the lugs or abutments E A crank0, connected to the shaft D, serves as a means for turning thestar-wheel. The lugs E E are at such distance from the center of thestar-wheel that they Will be engaged alternately by the arms of thestarwheel as the wheel is rotated. Thus one arm of the star-wheel willstrike the lug E and move the screen quickly to the right, andimmediately thereafter another arm will strike lug E and move the screento the left, thus producing a very rapid shaking of the screen.

As the screen is supported on swings, but very little power is requiredto move it in either direction. The longer the cords or rods a theeasier the swing will move, as in swinging a pendulum.

The star-wheel D is shown as having three arms. With such constructionthe screen will have six impulses or three complete reciprocations witheach rotation of the crank C.

It is evident that the star-wheel may have more or less than three arms,that the screen may be of any suitable form, and that the sustainingswings or swinging rods or cords may be connected to the screen in othersuitable manner.

A very important feature of the invention is that the screen will besupported as a swing or pendulum.

Screens have been heretofore made and supported on rolls or slideways,and caused to reciprocate by various mechanical connections. Suchrequire much more power to operate than when made to swing from asupport, as in my construction.

\Vhat I claim is- 1. The screen or sifter sustained by cords or rods soas to swing from a suitable support, lugs on the body of the screen, andan armed wheel having its arms in position to engage the said lugs asthe wheel rotates in. combination.

2. The combination of the frame or casing having pendulous supports, thescreen suspended thereby, the lugs on the screen-body obliquelyarranged, as described, and the armed wheel supported on the casingandhaving its arms extending between the lugs on the screen, allsubstantially as described.

In testimony whereofIatliX my signature in presence of two witnesses.

JARVIS BUFFUM WHITE.

Witnesses:

IRA N. GODDARD, J OSEPHENE O. GODDARD.

